Solder mask thickness

2/28/2017 2:22:03 PM

Dear members,

Recently we have found that solder mask thickness variation could lead to solder balling under QFN packages for a high reliability device.

Is there any industry proven method for solder mask thickness checking? Any equipment or any measurement method?

Which IPC standards describe requirements to solder mask thickness?

Any input is higly appreciated. Thank you in advance.

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3/2/2017 2:22:03 PM

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3/2/2017 2:22:03 PM

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3/2/2017 2:22:03 PM

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